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1. 发明授权

US5412498A Multi-RC time constant receiver 失效
标题翻译：多RC时间常数接收机
公开(公告)号：US5412498A
公开(公告)日：1995-05-02
申请号：US677044
申请日：1991-03-29
申请人： David M. Arstein , William L. Geller , Thomas E. Gles , Mark S. Thomas
发明人： David M. Arstein , William L. Geller , Thomas E. Gles , Mark S. Thomas
IPC分类号： H03K5/08 , H04B10/158 , H04L7/04 , H04L25/06 , H04J14/08
CPC分类号： H04L25/062 , H03K5/084 , H04B10/695 , H04L7/046
摘要： A protocol for fiber-optic communication systems, or other communication systems based on transmission of unipolar pulses having wide dynamic range provides for information to be transmitted in packets having a predictable time slot for each transmitter. The receiver for such protocol has a first relatively long RC time constant mode conditioned for reception of data packets whose time of arrival is well predictable and a second relatively short RC time constant mode conditioned for reception of asynchronous randomly received packets. In the relatively long RC time constant mode, each packet includes a preamble having a first clamp interval in which no pulse is transmitted, and a second clamp interval in which a continual pulse is transmitted. A transducer on the receiver translates the packets of pulses into differential electronic signals on first and second outputs. First and second coupling capacitors, receive respective outputs of the transducer and AC couples the signals to respective second terminals of the capacitors. First and second switches connect the second terminals of the respective coupling capacitors to ground during the first and second clamping intervals, respectively, of the preamble. By clamping the outputs of the transducer to ground during the first and second clamping intervals, a DC level for each incoming packet is instantly established independent of the magnitude of the incoming packet. In the asynchronous mode, relatively low impedance discharge paths are established to reduce the time constant of the receiver. An output circuit, connected to the second terminal of each of the first and second coupling capacitors, supplies sequences of digital output signals in response to the differential signals.
摘要翻译：用于光纤通信系统或基于具有宽动态范围的单极性脉冲的传输的其他通信系统的协议提供要在每个发射机具有可预测的时隙的分组中发送的信息。用于这种协议的接收机具有第一相对较长的RC时间常数模式，用于接收其到达时间是可预测的数据分组，以及用于接收异步随机接收分组的第二相对较短的RC时间常数模式。在相对长的RC时间常数模式中，每个分组包括具有其中没有脉冲被发送的第一钳位间隔的前同步码和其中发送连续脉冲的第二钳位间隔。接收器上的换能器将第一和第二输出端的脉冲分组转换成差分电子信号。第一和第二耦合电容器，接收换能器和AC的相应输出，将信号耦合到电容器的相应的第二端子。分别在前导码的第一和第二钳位间隔期间，第一和第二开关将各个耦合电容器的第二端子接地。通过在第一和第二钳位间隔期间将换能器的输出钳位到地，每个输入分组的DC电平立即被建立，而与输入分组的幅度无关。在异步模式中，建立相对低阻抗的放电路径以减少接收机的时间常数。连接到第一和第二耦合电容器中的每一个的第二端子的输出电路响应于差分信号而提供数字输出信号的序列。

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